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# Harpreet_Physics

• ## What is rank correlation?

the correction between these n pairs of rank is called the rank correlation in the characteristics A and B for that group of individuals.

• ## What are moments?

Moments are the statistical tools used to describe the characteristics of a distribution. moments are the arithmetic means of first, second, third and fourth.

• ## What is an assignment problem?

When one task is to be assigned to one person in such a way that the total person hours are minimized, then this kind of problem is known as assignment problem.

• ## What is method of variation of parameters?

The method of variation of parameters is the general method which we use to find out a particular solution of a differential equation by replacing the constants in the solution of the homogeneous differential equation by functions and evaluating these functions so that the original DE will be satisfied.

• ## What is regression analysis?

The term ‘regression analysis’ means some sort of functional relationship between two or more related variables. Regression is the estimation of unknown values of one variable from known values of another variable.

• ## What is the ratio test?

The ratio test is also known as D Alembert’s ratio test. It was first published by Jean le Rond d’ Alembert.

• ## What is an exact differential equation?

An exact differential equation is formed by differentiating its solution directly without any other process,Is called an exact differential equation if it satisfies the following condition-

• ## What is the L’Hospitals’s rule?

The rule of L’Hospital’s was given by  Guillaume de l’Hôpital. The technique discussed in this method is used to evaluate indeterminate forms. suppose we have two functions f(x) and g(x) and both are zero at x = a, then the fraction f(a)/ g(a) is called the indeterminate form 0/0.

• ## What is the method of least squares?

introduction to the method of least squares- When we find the area of a triangle then it depends on base and height, hence we can say that area of the triangle is the function of base and height.